Double-current ventilator.



A 0 9 2 1 R A D B T N E T P DOUBLE CURRENT VENTILATOR.

. APPLICATION IILBD SEPT. 3, 1902. N0 IODEL.

UNITED STATES Patented April 12, 1904.

* PATENT OFFICE.

DOUBLE-CURRENT VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 757,348, dated April 12, 1904.

Application filed $eptemher 3, 1902. Serial No. 121,993. (No model.)

To all whom it may concern.-

Be it known that I, HENRY ISMAY MORALEE Ross, engraver, a subject of the King of Great Britain, and a resident of i9 Moray Place, in

the city of Dunedin, in the British Colony of New Zealand, have invented a new and useful Improved Double-Current Ventilator, of which the following is a complete specification.

The object of this invention is to produce a ventilator of improved construction that shall cause a double current of air to flownamely, a downcurrent of fresh air that can also be cooled and disinfected, as may be considered necessary, while at the same time an upcurrent is induced, which draws up the vitiated or heated air from the inclosed space to be ventilated. These currents of air may be delivered to or taken from parts widely distant from each other. Thus the air can be changed by one ventilator, obviating inlets at low levels, most of which merely permit and do not force the air in and often cause drafts by not acting as arranged, while in my invention the air is taken from where it is purest and is forced in, as well as out, yet without drafts. For this purpose I arrange two tubes of unequal diameters and fix one within the other, preferably upright and concentric, the inner tube generally being the uptake and the annular space between the tubes the downtake. This, or both, are usually branched off to either ventilate several spaces or several points in one space, as needed. Trumpet-shaped openings arranged back to back pointing radially outward are secured near the top for collecting passing air from any direction. The air entering one or more of these openings is split by horizontal diaphragms which divide the current, deflecting part of the air-current upward and part downward. The downcurrent is either conveyed to one or, preferably,

' to several points, where it can impinge on water or any suitable disinfectant as it enters the space to be ventilated. The .upcurrent is arranged to induce an upward air movement in the central tube, which collects the foul or heated air from one or as many points as needed. Hoods and drips are added to prevent rain entering the apparatus. Arrows set forth the directions of the currents. Dotted arrows show the foul-air passages and the direction of the currents of same.

Referring to the accompanying drawings, Figure l is a section through the ventilator, showing the connections and currents. Fig. 2 is an elevation of the top part of the ventilator. Fig. 3 is a plan view.

Ais the outer tube or body, usually upright, as shown, and fixed over the space to be ventilated. A is the inner tube for the uptake Passing air enters at any of the openings B, going up for inducing the upcurrent through A and down guided by the vertical partitions O", that also secure A to A. These terminate above the bottom of the tube A, forming an annular chamber A from which branchesD are taken to the required inlets. These inlets may end as shown, and the air may impinge on disinfecting fluid in a bracket E, capable of removal for cleaning or refilling, or through usual openings. A shows small balanced doors to prevent reversal of the current.

B and C are drips, and 0 represents louvers,

which would be needed in exposed situations to prevent entrance of rain. F is a hood for a similar purpose.

As the air for inducingboth currents is taken from the same place, both currents are of the same relative proportions, which cannot be the case at all times when inlets and outlets are in different positions, and this is one of the causes of drafts, the inequality being made up by air passing through all available crevices.

Though not shown, it is obvious that branches can be taken from the tube A to various points, if needed. In this invention any suitable sizes or materials may be adopted.

Having described my invention, what I claim, and desire to be protected by Letters Patent of the United States of America, is

In a ventilator, the combination of two concentric verticaltubes of unequal diameters, the outer tube projecting abovethe inner tube and provided near its upper end but below the upper end of the inner tube with horizontallydisposed trumpet-shaped air-inlets, horizontal diaphragrns arranged in the air-inlets for dispace between the tubes, substantially as deviding the incoming air into up and down curscribed. rents, vertical partitions arranged in the annular space between the two tubes and terminating above the bottoms of said tubes, and Witnesses: balanced valves arranged to prevent back or HENTON MAOAULAY DAVEY, reverse currents of air passing up through the ELIZABETH ANN DAVEY.

HENRY ISMAY MORALEE ROSS. 

